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參數(shù)資料
| 型號： | ISP1521 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Hi-Speed Universal Serial Bus hub controller |
| 中文描述： | 高速通用串行總線控制器樞紐 |
| 文件頁數(shù)： | 17/53頁 |
| 文件大?。?/td> | 270K |
| 代理商： | ISP1521 |
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Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data
Rev. 03 — 24 November 2004
17 of 53
9397 750 13702
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9.2 Device descriptors and string descriptors settings using I
2
C-bus
9.2.1
Background information on I
2
C-bus
The I
2
C-bus is suitable for bi-directional communication between ICs or modules. It
consists of two bi-directional lines: SDA for data signals and SCL for clock signals.
Both these lines must be connected to a positive supply voltage through a pull-up
resistor.
The basic I
2
C-bus protocol is defined as:
Data transfer is initiated only when the bus is not busy.
Changes in the data line occur when the clock is LOW and must be stable when
the clock is HIGH. Any changes in data lines when the clock is HIGH will be
interpreted as control signals.
Different conditions on I
2
C-bus:
The I
2
C-bus protocol defines the following
conditions:
Not busy —
both SDA and SCL remain HIGH
START —
a HIGH-to-LOW transition on SDA, while SCL is HIGH
STOP —
a LOW-to-HIGH transition on SDA, while SCL is HIGH
Data valid —
after a START condition, data on SDA must be stable for the duration of
the HIGH period of SCL.
Data transfer:
The master initiates each data transfer using a START condition and
terminates it by generating a STOP condition. To facilitate the next byte transfer, each
byte of data must be acknowledged by the receiver. The acknowledgement is done by
pulling the SDA line LOW on the ninth bit of the data. An extra clock pulse needs to
be generated by the master to accommodate this bit.
For more detailed information on the operation of the bus, refer to The I
2
C-bus
specification
I
2
C-bus address:
The address of the ISP1521 is given in
Table 10
.
Table 10:
I
2
C-bus slave address
MSB
A7
A6
0
0
Slave address
A4
1
LSB
A1
0
Bit
Value
A5
1
A3
0
A2
1
R/W
0/1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISP1521BE | Hi-Speed Universal Serial Bus hub controller |
| ISP1561 | ISP1561BM |
| ISP1561BM | ISP1561BM |
| ISP1562 | Hi-Speed Universal Serial Bus PCI Host Controller |
| ISP1562BE | Hi-Speed Universal Serial Bus PCI Host Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1521BE | 功能描述:IC USB HUB CONTROLLER HS 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標準包裝:4,900 系列:- 控制器類型:USB 2.0 控制器 接口:串行 電源電壓:3 V ~ 3.6 V 電流 - 電源:135mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱:Q6396337A |
| ISP1521BE,518 | 功能描述:USB 接口集成電路 USB2 7-PORT HUB CTRLR RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1521BE,551 | 功能描述:USB 接口集成電路 USB2 7 PORT HUB RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1521BE,557 | 功能描述:USB 接口集成電路 DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1521BE518 | 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB HUB 80LQFP |
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